Riesz's Rising Sun Lemma
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Riesz's sunrise lemma: Let be a continuous real-valued function on ℝ such that as and as . Let there exists with . Then is an open set, and if is a finite component of , then .
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Contributed by: Soledad Mª Sáez Martínez and Félix Martínez de la Rosa (March 2011)
Open content licensed under CC BY-NC-SA
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